[BUG] org.opensearch.persistent.PersistentTasksExecutorFullRestartIT.testFullClusterRestart intermittent failure

[dblock]

Describe the bug

See #5144.

2> REPRODUCE WITH: ./gradlew ':server:internalClusterTest' --tests "org.opensearch.persistent.PersistentTasksExecutorFullRestartIT.testFullClusterRestart" -Dtests.seed=5FE27A861515F3EB -Dtests.security.manager=true -Dtests.jvm.argline="-XX:TieredStopAtLevel=1 -XX:ReservedCodeCacheSize=64m" -Dtests.locale=be-BY -Dtests.timezone=Europe/Guernsey -Druntime.java=17
  2> java.lang.AssertionError: 
    Expected: an empty collection
         but: <[{"id":"rsvnV4QBA7bGcm02BYEn","task":{"cluster:admin/persistent/test":{"params":{"param":"Blah"}}},"allocation_id":12,"assignment":{"executor_node":"SeUlKLdiT-W73R0c5Mn0tg","explanation":""},"allocation_id_on_last_status_update":0}]>
        at __randomizedtesting.SeedInfo.seed([5FE27A861515F3EB:ECD6B97E039BB44]:0)
        at org.hamcrest.MatcherAssert.assertThat(MatcherAssert.java:18)
        at org.junit.Assert.assertThat(Assert.java:964)
        at org.junit.Assert.assertThat(Assert.java:930)
        at org.opensearch.persistent.PersistentTasksExecutorFullRestartIT.lambda$testFullClusterRestart$2(PersistentTasksExecutorFullRestartIT.java:125)
        at org.opensearch.test.OpenSearchTestCase.assertBusy(OpenSearchTestCase.java:1049)
        at org.opensearch.test.OpenSearchTestCase.assertBusy(OpenSearchTestCase.java:1022)
        at org.opensearch.persistent.PersistentTasksExecutorFullRestartIT.testFullClusterRestart(PersistentTasksExecutorFullRestartIT.java:123)

https://build.ci.opensearch.org/job/gradle-check/6554/console

[sejli]

@samarthg1705, could you pick this up for OSCI?

[samarthg1705]

@samarthg1705, could you pick this up for OSCI?

Hi! Sure I'll just do that.